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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '067e4086e3051b08c828e39559dd9001691634957a9f5db279c8a26402fa8a37' 
  AND token = 'SBW38ne++iHMoYKTuBORhWBGcvkxkgcgl5EeQIKQCf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}